Valve seat



Oct' 24 1933- E. E, HEWITT. 1932039 VALVE SEAT Filed Nov. 14, .1951

INVENTOR.

ELLIS E. HEWITT By @Md/M A TTORNE Y.

Patented Oct. 24, 1933 I' rra-32,039,

` VALVE SEAT EllisE. Hewitt, Edgewood, ia., assigner to The Westinghouse Air Brake Company, Wilmer- Vcling, Pa., a corporation of Pennsylvania Application November '14; 1931 Serial No. 574,931

s cnims.-l (C1, ,251;167)

This invention relates to valve seat discs` and particularly to valve seat discs'forrvalves used in controlling the delivery` of iluid under pressure to fluid controlled or actuated devices, such for y example as the control switch for a uid pressure compressor governor.

' Heretofore where valve seat discs or packingl made of yielding or compressiole, material have been employed as the seat .of a valve 4subject to rapidly repeated operation, the disc becomes distorted dueto the pounding or hammering action of the valve and` also due to the absorption of liquids such as oil or water thatmay becon.- tained in the compressed fluid controlled' by" the centrally disposed iiuid passage through vthe disc sumciently to impair normal operation or the apparatus controlled and to cause'complete failure thereof. 'y Y An object of this invention is to provide a valvev seat disc having a fluid passage that is reinforced by a sleeve made of non-y`ielding material such as metal or a composition that is hard and infipervious' to oil or other liquids contacting with the disc, and which consequently vwill maintain a passage through the disc having fixed dimensions regardless of any distortion due to pounding of the' valve or to swelling oi the disc due to liquid absorption. v l

Another object of the invention is to provide a valve seat or packing disc that,.though iixed kon all 'sides including the periphery, will Vcause no alteration in the dimensions of the fluid pas- I sage therethrough, when distorted or swelled by conditions incident to its use. l v

A further object of the invention ist-o provide a valve seat or packing disc having the above ynoted characteristics, wherein the disc is provided with an annular sealing rib'for engaging the cover of the confining casing `and wherein the cover is'provided with an annular inwardly projecting rib adjacent to the iluid passage theree through, for engaging the disc whereby a iluid tight joint is made between the disc and cover for preventing the escape of, fluid from one side of the disc to the other,except through the vcen-'- tral fluid passage Vin the disc.

`These and other objects,- that will ,be made apparent throughout 'the further description of the invention, are attained'by means of the valve kseat disc or packing hereinafter described and illustrated in the accompanying drawing; wherein Fig. 1 is a longitudinal section through a govervalve. Such distortions frequently contract vthe* vshown in Fig; 1.

nor valve device employing a valve seat, disc embodying ieaturesof my invention, and

`Fig.V 2 is an enlarged sectionalV View through vthe improved valve seat disc.

Referring tothe drawing, the invention is disclosed as associated with a governor valve device l shown in i, orcontrolling/the delivery of iiuid under pressure from av storage reservoir 2 to fluid actuated switch for controlling thev supply of current to a compressor'pump driving 65 motor, the" latter named elements not being shown...f. v The'governor valve l comprisesa casing 3, having a chamber 4 in whichv a valve operating storno is mounted, and a chamber 6 in which a 70 valve 7 operates. A spring 8, surrounding the stem 5 and engaging a collar 9 on the stem and a nut il threaded intothe casing 3, serves to press the stem5 into engagement with the valve '7, and to normally move the valve to its seated position The tapered end v12 ofthe stem 5 makes a pointcontact with ataperedrecess 13 in the valve. j, Thefvalve 7 is provided with an annularV valve rib 1li adapted to engag'ethe valve Yseat rdiscii '30 that embodies features vof inyirivention. The valve seat is held in position 'a retaining plug 16 that is threaded into vthe casing vS and l,which is provided Vwith 4a iluid passage i7 that communicates withthe, storage reservoir 2fthrough g5l apipe 18.. v', i l l, f-

' In operationvhen the pressure in the reservoir 2 exceeds al predetermined amount andit becomes desirable tof open vthe circuit through the compressor pump motor,fthe pressure von the inner seated area of the valve rib 14 lifts the `valve 7 from the Aseat and permitsiiuid toilow through the passages 19 and Zitoa fluid actuated electric switch, not-showinwhich serves to control the said motor. Whenthe valve 7 closes the. 95

passage 22, theiiuidipressure on the annular face 23 lof the vlave 'l causes the valve tofmove tothe right hand position with a ysnap action'. When the pressure inthe storage,reservoiriallsbelow a predetermined amount, the spring 8 will force 100 the valve 'l into engagement withithe seat disc 15, thereby cutting offthe supply 'of fiuid under pressure iromthe reservoir`2` andcausing the electric switch toV be moved. to closedposition, thereby ,energizing the compressor pumprnotor. 105

Thisinvention resides particularly `in the` valve seat disc 15 which comprises a disc made of yielding or compressible materialsuch'as semi-hard rubber or composition and which is ccnned in a metal casing or support 24 that is closed by a 110 cover 25. The cover 25 is provided with a central opening 26 through which fluid from the reservoir 2 passes to the valve chamber 6 and to the passage 21. The valve rib 14 of the valve '7 extends through the opening 26 in the cover 25 and engages the disc 15.

An opening 27 in the casing 24 registers with the passage 17 in the plug 16 and in order to prevent the escape of fluid under pressure from one side of the valve seat disc 15 to the other, the face of the disc that is engaged by the valve rib 14 is provided with an annular sealing'rib 28 that tightly engages the inner surface of the cover 25. An annular bead or rib 29 on the inner face of the cover and adjacent the opening 26 there-, in, engages the face of the valve seat disc and augments the annular rib 28 in constituting a fluid tight seal.

The valve seat disc 15 is provided at its center witha fluid passage or opening 31, that is reinforced or lined by a metal ferrule or sleeve 32 havingan annular rib 33 that is embedded in the disc, which is usually and preferably made of molded material. The opening or passage 34 in the sleeve or ferrule is aligned with the opening 2.7 and passage 17. The ferrule is made of metal or other non-yielding material that is impervious to oil or water or any iiuid contacting with the valve seat disc, and consequently retains its shape and dimensions regardless of any distortion of the disc that might be caused by the pounding action of the valve in the immediate vicinity of the centralv opening in the disc.

In order to prevent distortion of the valve seat disc, inthe vicinity of the valve seat rib 14, that might be occasioned by reason of the swelling action of the` disc incident to absorption of oil or other liquids, the disc is provided with two oppositely disposed annular grooves 35, which reduce the cross-,sectional area oi' the disc at a point between the ferrule 32, and the confined periphery 36 thereof. This reduction in cross-sectional area of the disc at this point provides spaces into which the material may expand, thereby preventving any tendency of the material to expand in the vicinity of the valve seat rib 14.

It will be seen from the foregoing that a valve seat disc is provided that will maintain a fluid passage therethrough, having a fixed diameter, and that the valve seat will not be distorted even though the disc absorbs liquids and is conned o n all sides within a retaining casing. By reason of thesefeatures of improvement the life of the valve seat disc is materially increased and the occasion for replacement reduced to a minimum.

While but one embodiment of the invention is disclosed herein, it is obvious that changes, additions and omissions may be made in the construction without departing from the spirit of the invention.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. The combination with a packing disc made of yielding non-metallic material and adapted torbe confined at its periphery and having a fluid passage therethrough, of a metal reinforcing ferrule disposed within the passage for maintaining a fluid passage of fixed dimension regardless of the expansion of the said material, the said disc having an annular groove on a face thereof for providing a space into which material of the disc may flow.

2. A valve seat comprising a disc made of yielding material and conned on all sides and having an opening therethrough reinforced by a sleeve made of relatively non-yielding material.

3. A valve seat comprising a packing disc made of. yielding material and provided with a fluid passage therethrough, a rigid metal container for the disc confining one side and the periphery thereof, a cover for the container confining the other side of the disc and having an opening therethrough in alinement with said fluid passage-and a metal sleeve lining the passage.

4. A valve seat comprising a supporting member, a disc made of expansible material and coniined at its periphery and between said member and a central sleeve made of relatively nonyielding material, and provided with an annular groove for permitting the expansion of the material ofthe disc toward the groove.

5; A valve seat comprising a supporting mem'- ber, a disc made of expansible material and confined at its periphery and between said member confining the periphery of the disc and the other face thereof, a rigid cover for closing the casing having a iiuid passage therethrough and adapted to engage and compress the said rib, and provided with an inwardly projecting annular rib adjacent the said passage in the cover'for engaging and compressing the iirst said face of the disc, and a sleeve, lining the said passage in the disc, made of a relatively non-yielding material.

7. A valve seat comprising a packing disc made of compressible material and having a central fluid passage therethrough surrounded by an annular rib on one face of the disc, a rigid casing conning the periphery of the disc and the other face thereof, anda rigid cover for closing the casing having a fluid passage therethrough and adapted to engage and compress the said rib, and provided with an inwardly projecting annular rib adjacent the said passage in the cover for engaging and compressing the iirst said face of the disc.

8. A valve seat comprising a packing disc made of compressible material andv having a central fluid passage therethrough surrounded by an annular rib on one face of the disc, a rigid casing conning the periphery of the disc and the other face thereof, and a rigid cover for closing the casing having a fluid passage therethrough exposing a portion of the said disc constituting a valve seat surrounding the passage therein and adapted to engage and compress the said rib,

and providedvwith an inwardly projecting annuji lar rib adjacent the periphery of the said passage in the cover for engaging and compressing the first said face of the disc, and a reinforcing sleeve in the passage of the disc made oi a relatively non-yielding material.

ELLIS E. HEWITT. 

